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Volume 7, Issue 12
Displaying 1-17 of 17 articles from this issue
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Studies on the spectrochemical analysis of silicates. IV.Chujo MATSUMOTO, Fumio MATSUDA1958 Volume 7 Issue 12 Pages 751-757
Published: December 05, 1958
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSThis research has been undertaken to provide a direct-reading method of analysis of each element in fused-cast refrectories. The electrodes have been prepared by the briquetting electrode method which is based on electric furnace fusion. Our knowledge of the suitable briquets conditons are so fragmentary that much preliminary studies should be done to find out the best means for preparing the samples.
There have emerged that the standard deviation percentage of 2 to 5% are obtained in case of simultaneous analysis of various elements in fused casting refractories. However, the accuracy of determination of all elements will be much improved if the refractories samples are made more uniform.View full abstractDownload PDF (4904K) -
Kozo UENO, Tetsuhei TACHIKAWA1958 Volume 7 Issue 12 Pages 757-761
Published: December 05, 1958
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn the previous papers, the potentiometric titration of acids and bases has been investigated by using four bimetallic electrodes, Pt-Ni, Pt-Ag, Pt-W and Pt-Sb.
In this paper, the determinations of halides with silver nitrate (N/10 and N/100) are carried out. At the same time, the titration curves and the changes of potential at the end point (ΔE/ΔV) have been obtained. The results obtained are summarized as follows;
(1) In the titration of NaCl, the changes of potential at the end point for four couples are within 50 mV. in the case of both N/10 and N/100. At the end point, the potential rapidly decreases for Pt-Ni and Pt-Ag (Group I); on the other hand, the potential rapidly increases for Pt-W and Pt-Sb (Group II).
(2) In the titration of KBr, Pt-Ni is excellent.Pt-W, Pt-Ag and Pt-Sb are also applicable with good results. The inclination of potential at the end point is the same as stated in (1).
(3) In the titration of KI, Pt-Ni, Pt-W and Pt-Sb give good results with the figures belonging to Group II. On the other hand, Pt-Ag gives also good resalts and belongs to Group I.
(4) In the course of titration with AgNO3, the precipitate is gradually produced and adsorbed on the polished surface of electrode.When this phenomenon happens, the change in_ the potential becomes unstable, or the indication of the end point becomes obscure.View full abstractDownload PDF (836K) -
Studies on the determination of nitrogen in nitrocellulose and nitric acid. IV.Tetsuro MURAKAMI1958 Volume 7 Issue 12 Pages 761-766
Published: December 05, 1958
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSThe amounts which are necessary to be corrected in the determination of nitrogen by the Lunge method have been investigated. The loss of nitrogen oxide by its solubility in 8797% sulfuric acid was determined by the titration method and by the colorimetric method. The effect of temperature on the solubility was rather small. In the determination of nitrogen in nitric acid, a correction for dissolved nitrogen oxide gave a result in agreement with that determined by acidimetric method. In this case, the formation of nitrous oxide by side reaction is compensated for by the sulfuric acid remaining adhered to the wall of the burette. However, a nitrocellulose sample yielded carbon monoxide and carbon dioxide by side reaction and gave +0.2% error with the correction for solubility of nitrogen oxide and -0.3% error without the correction. Hence, a proposed correction formula for the amount of gas in the Lunge nitrometer is given.View full abstractDownload PDF (1313K) -
Studies on the determination of nitrogen in nitrocellulose and nitric acid. V.Testuro MURAKAMI1958 Volume 7 Issue 12 Pages 766-771
Published: December 05, 1958
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSA sample solution of nitric acid or nitrate is treated with 50 ml 0.2N stannous chloride solution and hydrochloric acid to 7N acidity, and then the solution is boiled gently for 15 minutes in an inert gas for reduction of nitrate radical. The residual stannous chloride, while hot, is titrated with a standard solution of 0.2N ferric chloride. 1.520 mg nitrogen can be determined in 25 minutes.
In this method, the nitrate radical is reduced to hydroxylamine, 1 mole of nitric acid consumes 3 moles of stannous chloride, and a small amount of nitrous oxide and ammonia is formed but it does not have any effect.
The determination of nitric acid by this method gave values in agreement with those obtained by the neutral acidimetric method. Application of this method to the determination of nitric acid in sulfuric acid-nitric acid mixtures, with a correction for nitrogen oxide by a separate estimation, gave results which were in agreement with those estimated by the Lunge nitrometer method.View full abstractDownload PDF (1128K) -
Studies on the systematic procedure of determining inorganic elements in plant tissues. III,Sadakata WATANABE1958 Volume 7 Issue 12 Pages 771-775
Published: December 05, 1958
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSA rapid method to determine nonmetals, such as silicon, phosphorus, sulfur, chlorine and boron in plant tissues has been investigated. In this method, plant samples were decomposed with alkali and the solution containing above five elements was used for the quantitative determination by photoelectric colorimeter. Accordingly, the result by this method was less precise than the standard gravimetric and volumetric method of analysis by A.O.A.C. and its precision in analytical result was limited only to the second decimal numbers. However, it required only 1 gram dried sample or 1/10 quantity of the standard method. Also, the procedure is simple and rapid. The time and expense required for analysis is much less than the standard method.View full abstractDownload PDF (876K) -
Studies on the Separation of Fission Products. III.Masuo YAGI1958 Volume 7 Issue 12 Pages 775-778
Published: December 05, 1958
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSCarrier-free praseodymium-144 was prepared by milking from cerium-144. Pure cerium-144 was isolated from an old fission product as a precipitate of ceric iodate after oxidation to CeIV with sodium bromate. The ceric iodate precipitates were made up into a column as shown in Fig. 1. The column was allowed to stand for two or more hours to saturate the growth of praseodymium-144. Then, the praseodymium-144 was eluted with 0.005N nitric acid solution at a flow rate of three milliliters per minute.
The radiochemical purity of the eluted praseodymium-144 was about 97 percent. It was slightly contaminated with the mother cerium-144.View full abstractDownload PDF (678K) -
Studies on metallurgical polarographic analysis. VI.Yoshiaki MIURA1958 Volume 7 Issue 12 Pages 779-782
Published: December 05, 1958
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSFor the purpose of making simultaneous determinations of tin (IV) and lead (II) by polarography with the use of ammonium bromide solution, polarographic behaviors of these ions have been investigated. It was found that a solution composed of 4M ammonium bromide, 0.5N hydrochloric acid, and 0.01% gelatin was the most suitable for analysis of solder. In this case, the second wave (E1/2;-0.52 V vs. S.C.E.) of tin (IV) and the lead wave (E1/2;-0.56 V vs. S.C.E.) were doubled each other; the estimation of lead was made by the difference in value of tin from the first wave and the total sum of tin and lead from the second wave. The solder (0.1 g) was dissolved in hydrochloric acid containing a small amount of nitric acid and the solution was diluted to a definite volume. A. part of this solution was used for taking a polarogram. Also, tin and lead were determined by the absolute quantitative method. The results of analyses of 10 kinds of samples by this method and chemical analysis showed good agreement. The time required for analysis of these two components was 3540 min.View full abstractDownload PDF (700K) -
Studies on metallurgical polarographic analysis. VII.Yoshiaki MIURA1958 Volume 7 Issue 12 Pages 783-786
Published: December 05, 1958
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSA rapid and simultaneous method for the determinations of cadmium, nickel, and zinc in brass and bronze by polarography has been investigated and the following method has been established. The sample (0.2 g) is dissolved in aqua regia, the solution is made weakly acidic (perchloric acid), 1 ml of a saturated solution of sodium sulfite and 10 ml of 1N sodium thiocyanate are added, and the solution is diluted to 50 ml. The free copper is separated as a precipitate of CuSCN by boiling. A part of the filtrate is treated with 1N ammonia and 1N ammonium chloride solutions, and the three components of nickel, cadmium, and zinc are simultaneously determined by polarography. Six kinds of samples were analyzed by this method, and good agreement was obtained with the results obtained by chemical analyses. The time required for analysis of the three components was 3540 min.View full abstractDownload PDF (743K) -
[in Japanese]1958 Volume 7 Issue 12 Pages 787-788
Published: December 05, 1958
Released on J-STAGE: June 30, 2009
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[in Japanese], [in Japanese]1958 Volume 7 Issue 12 Pages 788-789
Published: December 05, 1958
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESS -
[in Japanese], [in Japanese]1958 Volume 7 Issue 12 Pages 789-790
Published: December 05, 1958
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESS -
[in Japanese]1958 Volume 7 Issue 12 Pages 790-792
Published: December 05, 1958
Released on J-STAGE: June 30, 2009
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[in Japanese], [in Japanese], [in Japanese]1958 Volume 7 Issue 12 Pages 792-794
Published: December 05, 1958
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESS -
[in Japanese]1958 Volume 7 Issue 12 Pages 794-796
Published: December 05, 1958
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESS -
[in Japanese]1958 Volume 7 Issue 12 Pages 797-802
Published: December 05, 1958
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESS -
1958 Volume 7 Issue 12 Pages 802
Published: 1958
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (120K) -
[in Japanese]1958 Volume 7 Issue 12 Pages 803-807
Published: December 05, 1958
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (1212K)
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